On or about 16 September, 1949, M. H. Winkler, trading as M. H. Winkler Manufacturing Company, of Baton Rouge, Louisiana, through his agent, Ray Williams, caused his Federal tractor to be attached to a Hobbs trailer, both owned by him, for the purpose of transporting bleachers to a customer in Norfolk, Virginia. The next day, while traveling north and at a place on State Highway No. 49 in Davidson County, North Carolina, approximately twenty miles south of Asheboro, the tractor owned by the defendant Winkler became disabled. The tractor and trailer were then parked in a farmyard. Winkler's agent, Williams, called him over the 'phone and advised him of the breakdown. Williams was instructed by Winkler to contact the Federal tractor agent in Greensboro, who was John Robbins, and secure assistance so the journey could be continued. As a result of arrangements cleared by 'phone between Williams and Robbins, the defendant George McPherson sent his Ford tractor, with his brother James McPherson driving, to the scene of the breakdown for the purpose of moving the trailer and bleachers on to Norfolk. Williams and James McPherson together detached the trailer from the Federal tractor and attached the trailer to the Ford tractor owned by George McPherson. After the attachment had been made, the tractor and trailer were backed into the highway and headed north, preparatory to going to Greensboro to pick up George McPherson and proceed on to Norfolk, with James McPherson then driving and Williams riding in the cab, when a car operated by plaintiff's husband collided with the trailer, resulting in injuries to the plaintiff which are the basis of this action.